Threshold



J. PLYM Nov. 28, 1933 THRESHOLD Filed March 20, 1931 & W

7 II, I Ill/fl I v x Patented Nov. 28, 1933 STATESd THRESHOLD Francis J.Plym, Niles, Mich, assignor to The Kawneer Company, Niles, Mich., acorporation of Michigan Application March 20, 1931.

Serial No. 523,981

4 Claims. (01. 20-69 This invention relates to thresholds, and more inparticular to such a construction adapted to be placed below or under adoor or other closure and adapted to receive the closure and form a 5weather-tight seal therewith.

JAmong the objects of the present invention is to provide a novelthreshold construction adapted to be mounted on a floor or other basedirectly below a door or closure, and adapted to receive a rib or flangemounted on such closure, when the same is in shunt or closed position.

The present construction is provided with grooves or ribs runninglongitudinally thereof for the purpose or" preventing the entrance ofrain, snow and the like.

A further object of the invention is the provision of a thresholdconstruction formed or cast with supporting legs whereby the same may beconstructed in one piece without the possibility of play or shiftingbetween the support and the threshold.

Another object of the invention is the provision of a threshold providedwith grooves or corrugations on both the upper and lower sides thereofwhereby to limit the amount of material necessary in the formation ofthe structurewithout the elimination of the necessary strength. Thisconstruction further lessens the cost of material and permits a cheaperconstruction.

A still further object of the invention is the provision of thethreshold plate with under-cut grooves or channels forming anchoringmeans when the threshold is mounted upon a concrete floor or otherfiller.

A further object of the invention is the provision of additionalanchoring means associated or engaging the supporting legs of thestructure for suitably supporting and retaining the threshold in thefiller or material of the floor. By reason of this construction, allretention is from the under-side of the threshold plate, thuseliminating screws or other retaining means passing through the plate.

Further objects are to provide a construction of maximum simplicity,efiiciency, economy, and ease of assembly; and such further objects,advantages, and capabilities as will later more fully appear, and areinherently possessed thereby.

The invention further resides in the combination, construction andarrangements of parts illustrated in the accompanying drawing, and whileI have shown therein a preferred embodiment, it is to be understood thatthe same is susceptible of modification and change, and comprehendsother details and constructions, without departing fromthe spirit of theinvention.

In the drawing:

Fig. l is a fragmentary viewin perspective,

disclosing the invention in position in the doorway or other closure ora building.

Fig. 2 is a vertical cross sectional View of the threshold constructiondisclosed in Fig. i.

Fig. 3 is a vertical cross sectional view similar to Fig. 2, butdisclosing an alternate construction;

Referring more particularly to the disclosure in the drawing, theembodiment selected to illustrate the invention in Figs. 1 and 2,comprises a threshold plate 1 adapted to form a base below '30" otherclosure is shut, a weather-tight seal exists between the interlockingflange or rib 8 and the threshold. Screws or the like 10 are adapted toretain the plate 9 on the lower edge of the door or closure.

The central portion 3 of the threshold is provided on its upper andlower surfaces with grooves or corrugations 11 and 12, respectively, theupper corrugations or grooves being designed for pre venting theentrance of rain, snow, or the like. These grooves 11 further preventthe passing in WC of mud or dirt, as it provides an excellent scraper.Should water or dirt find its way upon the upper surface or" the plate,it will be retained in the grooves, the water being prevented fromflowing or travelling through to the interior unless a sufiicientquantity is forced through and. fills all the corrugations. As clearlydisclosed in Fig. 2 of the drawing, the threshold is formed withintegral supporting legs 13 whereby the entire construction may beformed of one piece and as a unit. Suitable retaining means such asscrews or the like 14 are provided for retaining the threshold to thefloor or base. Although such retaining means are disclosed as passingthrough the central or raised portion 3 of the threshold, it is to beunderstood that such retaining means may be placed in any suitable orconvenient position, including in the sides or flanges 4 and 5.

In Figure 3 is disclosed an alternate construe tion of threshold adaptedprimarily for use where the floor 15 is constructed of concrete or thelike,

or where a filler is provided beneath the threshold. The outerconstruction of the threshold 1 is similar to that disclosed in Figs. 1and 2, and comprises a central or raised portion 3 and sides ordownwardly extending flanges 4 and 5 Grooves or corrugations 11 areprovided in the upper surface of the plate. The undersurface of theplate is provided with under-cut grooves or channels 16, intermediate aplurality of supporting members or legs 1'7. These undercut grooves orchannels 16 provide suitable retaining means for anchoring the thresholdto the plastic filler or concrete of the floor. Additional retainingmeans comprise wires or other anchors 18 passing through openings 19 inthe legs or supports 1'7. These wires or anchors become embedded in theplastic composition or concrete of the floor. By this construction, noexterior retaining means such as screws or the like are necessary forattaching and retaining the threshold to the base or floor.

Although I have disclosed in Fig. 2 but two legs or supporting members,and in Fig. 3 three supporting members, it is to be understood that anysuitable number may be provided on the threshold, as desired.

Having thus disclosed my invention, I claim:

1. A threshold construction for a door or other closure, comprising amember provided on its upper and lower surface with corrugationsextending longitudinally thereof and formed with outwardly anddownwardly sloping flanges, a. bead along one longitudinal edge forreceiving a member on the door to provide a weather-tight closure, andsupporting legs formed integral with the under surface of said member atthe upper portion of said flanges.

2. A threshold comprising a metal plate corrugated on its upper andlower surface and having a longitudinally extending rib along one edgethereof to provide a groove therebelow for receiving a flanged plate ona closure member to form a weather-tight seal therebetween when saidclosure is in closed position, and legs formed on said plate forsupporting the same.

3. A threshold comprising a member provided with a corrugated upper andlower surface, said lower corrugations providing an anchoring means, andintegral legs formed on its under surface providing a support therefor,and anchoring means associated with said legs and embed\ ded in thematerial of the floor for additionally retaining the member inengagement with the floor.

4. A threshold comprising a metal plate having corrugations on its upperand lower surface, [00 the corrugations on the upper surface beingstaggered in relation to the corrugations on the lower surface, saidupper corrugations providing both a scraper and a means to prevent theentrance of water etc., and said lower corrugations 105.

providing anchoring means.

FRANCIS J. PLYM.

